import java.nio.charset.StandardCharsets;
import java.util.Objects;

/**
 * @Author: linzp
 * @Date: 2023/07/31/14:41
 */
public class demo077313 {
    public static void main(String[] args) {
        String a = null;
        System.out.println(Objects.requireNonNull(a).getBytes(StandardCharsets.UTF_8));
    }
}
